Scientists created elements 93 through 118 in a laboratory. These artificial elements don’t exist naturally and haven’t survived longer than several milliseconds at a time. The atomic weight of these elements is based on the element that survived longest when it was created, and can change based on future research.

By using the guide above, you’ll be able to read the periodic table with ease in no time!

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Megan Ray Nichols is a freelance science writer and science enthusiast. Her favorite subjects include astronomy and the environment. Megan is also a regular contributor to The Naked Scientists, Thomas Insights, and Real Clear Science. When she isn't writing, Megan loves watching movies, hiking, and stargazing.

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